Building a 30 piece, 3mm led strip. Blue LED's, 3.2-3.5V forward voltage, 20mA DC forward current. I have a few different AC to DC wall convertors and understand the building in series or parallel and the current or voltage requirements. I'm proposing to do 10 leds in series and parallel 3 of these to make up the 30 leds. My convertor that i would like to use ishas a DC output of 12V @ 1.25A. Suggestions? resistor sizes? would you build it as i am 3 legs of 10 leds in parallel? thanks